Sound propagation in liquid He3 at elevated density and temperature to 0.35 °K

The velocity of propagation and attenuation of sound in liquid He3 are measured at densities of 0.0849, 0.0921, 0.0961, 0.1025, and 0.1095 g/cm3 over the temperature range 1.4−0.35 °K at frequencies of 18.96 and 24.40 MHz. The experiments indicate that in the range studied the speed of sound is linearly dependent on helium density. Sound attenuation data are used to calculate the first viscosity coefficient. It is found that at temperatures below ∼0.8 °K the first viscosity decreases with increase in He3 density.

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